We propose in our thesis to give consistency to the philosophy of Maurice Merleau-Ponty, highlighting the importance of the problem of "meaning", "expression", and especially "language". In our view, if its phenomenology of the body, which relies on the phenomenal field, and its ontology of the flesh, which is maintained through the notion of the flesh as a negativity and at the same time, a common texture of the beings can be placed as a single philosophy, it is through a continuity that is involved in its passage from the simultaneity of meaning and expression that is shown by behavior in The structure of behavior and Phenomenology of perception to the being of flesh functioning in as two opposing terms in The Visible and the Invisible. H...